Overcharging 68Dart...need some short fused help (pun intended:)

Is your ignition system electronic or still points. If you changed to electronic maybe you have the incorrect voltage regulator ( points vs electronic). Get a 2 field alternator and a electronic voltage regulator say 72 or so . Find the wiring directions online on how to convert from a 1 field alternator to a 2 field alternator and see what happens. While you are at it replace the ballast resistor with a fresh one made for electronic ignition mopars like a 72 or. so.

I always upgrade all my cars to the 2 field alternator system. it seems to be much more reliable than the 1 field rarley pop a ballast resistor or have an ignition module go out. and you might as well upgrade to electronic ignition while you are at it, if you have not done so. Order the kit from summit and ditch the points.

Ditch all that relay crap you should not needed it, If you are ordering the 2 field version from napa, ask for the a/c version it will have an extra pully but will have higher amperage, then when you have more time buy a powermaster alternator

it is also possible with all the playing around you have been doing the battery needs to charge it self so it reads higher does it settle down after a minute or so if you hold at 2,000 rpm. Does the vr stop smoking?

The ignition and charging system is quite simple so don't overthink it.